Edited September 12, 2021
at 04:42 PM
Amazon has GearIT-brand Ultra High Speed HDMI cables, 10 feet, for $3.99, free shipping with Prime.
Ultra High Speed HDMI cables are required for HDMI 2.1.
I don't have any first-hand experience with the GearIT brand, but it looks bit more professional than the typical off-hand brands found on Amazon.